Protective apparatus.



%E. E. F. CREIGHTON.

PROTECTIVE APPARATUS.

APPLICATION FILED JUNE 10. 1914.

1,206,677. Patented Nov. 28, 1916.

Witnesses Inventor:

{ X 764%. ElmerEffCreigf-lton,

9. w, w 8 fiZMM H is :yqttorn e 4O structed as to be a condenser 45 fre;

insulators distributed along the line an ab- UNITED STATES PATENTOFFICE.

ELIMIER E. F. CEEIGHTON, OF SCHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL-ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

PROTECTIVE APPARATUS.

Specification of Letters Yatent.

Application filed June 10, 1914. Serial No. 844,188.

oapparatus and more especially to an improved means for the protectionof high tension systems of distribution and the apparatus connectedthereto.

It is well known that in systems of this nature a condenser withresistance in series connected between two conductors or between theconductors and ground will absorb a large amount of energy from a waveof high frequency and steep wave front. It

is also known that waves of this nature are frequently set up on theline due to atmospheric disturbances, switching, resonance, etc. Littleuse, however,has been made of the protective effect of a condenser withresistance in series to relieve the line of such disturbances because ofthe expense of such an installation.

, In carrying my invention into effect, by

a small and comparatively inexpensive addition to the present standardline construction, I am able to secure the advantages of an absorber ofthe type mentioned and divert from the line a large amount of the energyof high frequency disturbances. The

35.most approved form of high tension transmission line constructioncalls for the use of several suspension disk-type porcelain insulatorsin series to support the conductor. Each of these insulator disks may beso conof appreciable capacity. At the present time, however,theresistance between the top disks of the series attached to the differentconductors is practically negligible. In order, thereto make each one ofthese series of sorber I introduce a. resistance in series with eachserles of insulators.

In the accompanying drawing I have '50 illustrated diagrammatically asuitable way in which my invention may be carried into efi'ect. As hereindicated, 1, 2, 3, 4 and 5 are disk insulators supporting the wire 6from the arm 7 of a transmission line tower which according to approvedmethods of construction-is of metal and is grounded. An insulating joint8 of low electrostatic capacity is placed between the insulators and thesupporting arm 7. This insulating joint is shunted by a high resistance9. By this means it will be seen that a connection comprising acondenser with resistance in series is provided between any twoconductors of the transmission line or between any conductor and ground.An arrangement of this nature will not absorb any appreciable amount ofenergy of the low frequency line current but will absorb a large amountof energy from high frequency disturbances and afford a high degree ofprotection to the line.

As an alternative method of construction one ofthe insulator disks maybe shunted as indicated by a high resistance 10. In this case, however,it will of course be necessary to provide an additional disk to securethe desired insulation for the line.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. Means for protecting a system of distribution from the effects ofhigh frequency disturbances arisin therein, comprising disk insulatorsfor insulating the line conductors of saidsystem from earth, saidinsulators having appreciable capacity so as to offer a much lowerimpedance to the flow of high frequencycurrents betweenthe l'ineconductors and earth currents of the normal frequency of the system andhigh resistances between said insulators and earth for absorbing theenergy of high frequency disturbances occurring in the system.

2. Means for protecting asystem of distribution from the effects of highfrequency disturbances arising therein "comprising earthed supports forthe line conductors of said system, insulators for insulating said lineconductors from said supports, said insulators having appreciablecapacity so as to offer a much lower impedance to the flow of highfrequency currents between the line conductors andearth than'to the flowof currents of the normal'frequency of the system and high resistancesbetween said insulators and said supports for absorbing the energy ofhigh frequency disturbances occurring in said system.

3. The

tribution of line conductor, a support than to the flow of combinationin a system of dissulators for each conductor at each support forinsulating said conductors from ground and from each other, saidinsulators having appreciable capacity so as to ofier a much lowerimpedance to the flow of high frequency currents than to the flow ofcurrents of the normal frequency, and a high resistance in series witheach series of disk insulators to absorb the energy of high frequencydisturbances occurring in the system. In witness whereof, I havehereunto set my hand this 9th day of June, 1914:.

ELMER E. F. CREIGHTON. Witnesses:

BENJAMIN B. HULL, HELEN ()RFoRD.

